Regular verification can be marked with a *.

RT:, please help.
now reg = / ^ [wd] {17} $/ I;

now if you need these 17 digits, you can take the * number at will

Mar.09,2021

/ ^ [\ w\ d\ *] {17} $/ I;


/ ^ [wd*] {17} $/ I
http://regex.zjmainstay.cn/r/.

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